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  • Open Access

Quantum-geometric spin and charge Josephson diode effects

Niklas L. Schulz*, Danilo Nikolić†, and Matthias Eschrig‡

  • *Contact author: niklas.schulz@uni-greifswald.de
  • †Contact author: danilo.nikolic@uni-greifswald.de
  • ‡Contact author: matthias.eschrig@uni-greifswald.de
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Phys. Rev. B 112, 104514 – Published 26 September, 2025

DOI: https://doi.org/10.1103/nb38-v1jq

Abstract

We present a general mechanism for large charge and spin Josephson diode effects in strongly spin-polarized superconductor-ferromagnet hybrid structures with a noncoplanar spin texture, formulated in terms of quantum-geometric phases. We present necessary conditions for this effect to occur, and show numerical results for disordered materials relevant to applications. We calculate Josephson diode efficiencies for both charge and spin diodes and show that a spin-diode efficiency of 100% can be reached. Finally, we present a SQUID device that can switch between nearly pure spin-up and spin-down equal-spin supercurrents across the ferromagnet by reversing the flux. These findings establish functionalities that are absent in coplanar spin textures.

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Physics Subject Headings (PhySH)

Corrections

31 August, 2026

Correction: A typographical error in Eq. (1) has been fixed.

See Also

Theory of quantum-geometric charge and spin Josephson diode effects in strongly spin-polarized hybrid structures with noncoplanar spin textures

Niklas L. Schulz, Danilo Nikolić, and Matthias Eschrig
Phys. Rev. B 112, 104515 (2025)

Article Text

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Outline

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Phys. Rev. B 112, 104514– Published 26 September, 2025
  • Received 20 January 2025
  • Revised 6 May 2025
  • Accepted 14 August 2025
  • Corrected 31 August 2026
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